IL13 and pulmonary arterial hypertension: As previously described [2–4], IL-13 production was significantly increased in DEP-PAH- and B[a]P- stimulated PBMCs from asthmatic (respectively 1.77 ± 0.27 and 1.73 ± 0.25 versus 1.28 ± 0.27 ng/ml for controls, p<0.05) but not from healthy subjects.